Imaging objects hidden in highly scattering media using femtosecond second-harmonic-generation cross-correlation time gating
Abstract
A combination of 100-fs cross-correlation time gating and lock-in amplifier detection is used to image objects hidden in highly scattering media. The image is formed from the ballistic component of the ultrafast laser pulse while the diffuse component is eliminated by time gating using cross-correlation second-harmonic generation. The low-noise lock-in amplifier detection method and the high-repetition-rate mW pulsed laser enable imaging through a random medium as thick as 28 scattering mean free paths with submillimeter resolution.
- Publication:
-
Optics Letters
- Pub Date:
- July 1991
- DOI:
- 10.1364/OL.16.001019
- Bibcode:
- 1991OptL...16.1019Y
- Keywords:
-
- Harmonic Generations;
- Imaging Techniques;
- Laser Beams;
- Light Amplifiers;
- Light Scattering;
- Ultrashort Pulsed Lasers;
- Cross Correlation;
- Laser Mode Locking;
- Submillimeter Waves;
- Temporal Resolution;
- Lasers and Masers